KB-65 Rail Fastening System

The GOST KB-65 rail fastening system (скрепление КБ-65) is an internationally recognized benchmark for track construction across the CIS region and Central Asia, including vital transit corridors throughout Kazakhstan, Uzbekistan, and Russia. Engineered to withstand the extreme axle loads of heavy freight and passenger traffic, this separate fastening assembly delivers reliable track gauge retention, dynamic vibration dampening, and essential electrical insulation.

As an established global railway track hardware manufacturer, Signum Rail Fasteners China manufactures and supplies the complete KB-65 fastening assembly to strict international and GOST standards, serving major railway operators, contractors, and track renewal tenders worldwide.

What is the KB-65 Rail Fastening System?

The KB-65 is a separate (split-type) intermediate rail fastening system designed specifically for securing R65 rails to reinforced concrete sleepers.

Unlike direct fastening mechanisms, the KB-65 utilizes a two-tier mechanical architecture:

· Rail Clamping: Dedicated terminal bolts and rigid PC clamps press the rail foot firmly onto the tie plate.

· Sleeper Anchoring: Independent embedded anchor bolts secure the tie plate directly to the concrete sleeper.

This mechanical separation isolates dynamic rolling stock forces, preventing impact energy from transferring directly to the concrete sleeper anchor points. The result is uniform load distribution, minimized sleeper micro-cracking, and consistent track alignment under heavy acceleration and braking.

Complete Bill of Materials: KB-65 Fastening Unit Components

Signum Rail Fasteners China manufactures and supplies every mechanical and elastomeric component of the KB-65 assembly in strict accordance with official GOST quality standards:

Detailed Technical Specifications by Component

1. KB-65 Baseplate (Подкладка КБ-65)

The KB-65 Rail Baseplate manufactured by Signum Rail serves as the foundational structural platform of the entire assembly, positioned directly between the concrete sleeper and the rail foot.

· Dimensions: 370 mm (Length) × 140 mm (Width) × 47.5 mm (Height).

· Structural Design: Features two through-holes for M22×175 sleeper anchor bolts and two raised side bosses that hold PC clamps and T-head bolts firmly in place.

· Material Properties: Manufactured from carbon steel conforming to GOST 380 (Ст4пс, Ст4кп, Ст4сп) or GOST 535 (Grade 2/3), optionally alloyed with copper and manganese for enhanced corrosion resistance.

2. PC Rigid Rail Clamps (Клемма ПК)

The PC Rail Clamp (Terminal PC) locks the bottom flange of the R65 rail down to the tie plate.

· Manufacturing Standard: Manufactured in strict accordance with GOST 22343-2014.

· Dimensions & Area: Approx. 60 × 62 × 65 mm with a cross-sectional area of 14.7 cm².

· Function & Performance: By delivering steady, high downward clamping force via the M22 terminal bolt, the clamp stops longitudinal rail creeping and prevents rail overturning during heavy freight transits.

3. Terminal Bolt and Nut Assemblies (Болт Клеммный М22х75)

The clamping power of the PC terminal relies on a dedicated fastening set compliant with GOST 16016-2014:

· M22×75 T-Head Bolt: Slots into the recessed grooves of the KB-65 tie plate to prevent bolt spinning during torquing.

· M22 Hex Nut: Tightened to exact torque requirements to maintain uniform downward pressure.

· Double-Turn Spring Washer (Шайба Двухвитковая, GOST 21797): Maintains continuous spring tension, eliminating bolt loosening caused by continuous track vibrations.

4. Embedded Anchor Bolt Assemblies (Болт Закладной М22х175)

Operating independently from the rail clamps, the anchor bolt assembly secures the tie plate to the sleeper under GOST 16017-2014:

· M22×175 Anchor Bolt: High-tensile bolt anchored into the pre-cast sleeper dowel socket.

· Insulating Bushing & Washer: High-strength polymer bushing isolates metal fasteners from the concrete sleeper, preventing signaling track circuit interference and moisture corrosion.

5. Elastomeric Shock Pads & Gaskets (Прокладки ЦП-328 / ОП-356)

Two distinct rubber damping pads protect the railway superstructure from mechanical impact and electrical leakage:

· Under-Rail Pad (CP-328 / ЦП-328): Placed between the base of the R65 rail and the steel tie plate to absorb dynamic wheel impacts.

· Under-Plate Pad (OP-356 / ОП-356): Positioned between the bottom of the KB-65 plate and the concrete sleeper surface to eliminate friction wear and concrete spalling.

Proven Field Applications Across Broad-Gauge Corridors

The KB-65 fastening system supplied by Signum Rail Fasteners China is deployed across critical transit arteries in Central Asia and Eastern Europe, including major transport hubs such as Tashkent, Uzbekistan.

It is the standard choice for:

· Heavy-Haul Freight Lines: Capable of handling continuous axle loads of 25–27 metric tons.

· High-Traffic Mainlines: Providing minimal gauge deviation over extended maintenance intervals.

· Severe Climate Regions: Delivering dependable mechanical performance across temperature swings ranging from -50°C to +50°C without metal embrittlement.

Why Choose Signum Rail Fasteners China?

As a specialist railway track hardware manufacturer based in China, Signum Rail Fasteners China combines large-scale production capacity with rigorous metallurgical quality control.

Scalable Production Capacity

· 2 Automated Bolt Lines: Over 2,000,000 track bolts produced annually.

· 3 Heavy Tie Plate Lines: Over 50,000 baseplates produced annually via precision casting and rolling.

· 2 Precision Clip Lines: Supplying over 5,000,000 elastic/rigid rail clips and 3,000,000 gauge baffle plates annually.

Certified Quality Control & Customization

· In-House Testing Facility: Our dedicated Technical Center and Quality Inspection Lab conduct chemical spectrometry, tensile load testing, and dimensional verification on every production batch.

· 100% Pre-Shipment Inspection: Every order is inspected to guarantee full adherence to GOST tolerances and international track standards.

· Custom Fabrication: OEM production is available directly from your technical drawings, with custom steel grades, surface coatings, or packaging specifications.

Request a Quote from Signum Rail Fasteners China

Need certified GOST KB-65 rail fastening systems, PC clamps, or replacement track bolts for your next mainline or siding project? Contact the technical sales team at Signum Rail Fasteners China today to receive technical data sheets, CAD drawings, and factory-direct pricing.